EP0661524B1 - Faseroptischer Transmissionssensor mit Modulator - Google Patents
Faseroptischer Transmissionssensor mit Modulator Download PDFInfo
- Publication number
- EP0661524B1 EP0661524B1 EP94810697A EP94810697A EP0661524B1 EP 0661524 B1 EP0661524 B1 EP 0661524B1 EP 94810697 A EP94810697 A EP 94810697A EP 94810697 A EP94810697 A EP 94810697A EP 0661524 B1 EP0661524 B1 EP 0661524B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- fibre
- principal axis
- light
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 title claims description 12
- 239000013307 optical fiber Substances 0.000 claims description 40
- 230000003287 optical effect Effects 0.000 claims description 35
- 239000000835 fiber Substances 0.000 description 30
- 230000010287 polarization Effects 0.000 description 12
- 239000003365 glass fiber Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/344—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using polarisation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35341—Sensor working in transmission
- G01D5/35351—Sensor working in transmission using other means to detect the measured quantity
Definitions
- the invention is based on a fiber optic Transmission sensor with modulator according to the generic term of Claim 1.
- ⁇ / 4 plate that will Light back into the linear polarization state transformed back.
- the direction of polarization of the emerging light is parallel to that of the entering.
- the light is transmitted through the two HB glass fibers returned and in a transmitter-evaluation unit in a first Branch and combined via an input polarizer decoupled a second branch from the input light path.
- This Sagnac current sensor is the phase difference of the two light beams measured by interference formation.
- a phase modulator e.g. B. by Stick a wound part of the HB glass fiber on a piezoelectric element, by which both light beams are phase modulated.
- the phase of the two Light rays are not modulated in the same cycle.
- a Analysis of the periodic change in the interference signal provides a DC and an AC component of the Modulation frequency, which parts by a Relationship formation are evaluated, as well as higher Harmonic.
- the length of the sensor fiber is with the strength and the frequency of the phase modulation.
- One of 2 independent light beams is used as a reference for the others used.
- the signal evaluation is relative with this type of sensor complex.
- the invention as defined in claim 1 solves the task of a fiber optic transmission sensor with such a modulator of the type mentioned further develop that easier signal evaluation becomes possible.
- An advantage of the invention is a comparative one simple construction of the light transmission path from one Light source to the fiber optic sensor. A temperature dependent Rotation of twisted fiber spools can be compensated become.
- the invention is described below using an exemplary embodiment explained.
- the only figure shows schematically one Light transmission from a light source via HB light fibers into a sensor fiber.
- a monochromatic light source (1) preferably from a laser diode
- monochromatic light is emitted a monochromator, not shown, in a polarization-maintaining, strongly birefringent so-called HB light fiber or feed optical fiber (2) with two optical Major axes, d. H. with a first and second orthogonal to it main optical axis, coupled.
- HB light fiber or feed optical fiber (2) with two optical Major axes, d. H. with a first and second orthogonal to it main optical axis, coupled.
- the main axis of the feed glass fiber (2) is the Speed of propagation of light is greater than in the second main optical axis.
- the direction of polarization of the from the light source (1) to be coupled parallel to one of the two main optical axes of the Lead fiber (2).
- an optical coupling point or splice point (3) is the feed optical fiber (2) with a polarization-maintaining, highly birefringent HB optical fiber or first reference light fiber (4) with two optical Major axes, d. H. with a first and second orthogonal to it main optical axis optically connected, the two main optical axes of the first reference optical fiber (4) opposite the two main axes of the feed optical fiber (2) are rotated by 45 °.
- another splice (5) is the first reference optical fiber (4) with one under construction same second reference optical fiber (6) connected, however the two main optical axes of the first reference optical fiber (4) opposite the two main axes of the second Reference optical fiber (6) are rotated by 90 °.
- the first Reference optical fiber (4) has the same length (1) as the second Reference fiber (6).
- the second reference optical fiber is in a third splice point (7) (6) with a low birefringent so-called.
- LB optical fiber or optical fiber (8) optically connected.
- the optical fiber (8) first forms a ⁇ / 4 light guide loop (9) and then in several loops an optical sensor (10) or Faraday sensor e.g. B. for the detection of a current through a Power cable, not shown, in the interior of the Sensor loop (10).
- An output (11) of the optical fiber (8) can with a polarimeter or another modulator or an HB optical fiber are in optical connection (not shown).
- (12) is a vibration level of the from the light source (1) emerging light parallel to a major axis of the Lead fiber (2) designated.
- (13) denotes one Vibration level of the light at the exit of the splice (3).
- the fact that the two in the splice (3) coupled HB light fibers (2, 4) with respect to Light is turned in the direction of its main axes by 45 ° same amplitude in both polarization-maintaining Main axes coupled.
- each polarization component has from the input of the first Reference optical fiber (4) practical at the splice (7) go through the same optical path, d. that is, the two Polarization components are coherent again.
- the relative Phase is not exactly known; it depends on asymmetries in the two first and second reference light fibers (4, 6), d. H. of temperature and manufacturing fluctuations.
- phase modulator you can Influence phase shift, either statically with a constant component or dynamic with a predefinable one Frequency.
- the fiber optic transmission sensor according to the invention is as a polarization control element at the entrance of the LB light fiber (8) usable. It is controlled by the DC component of the phase modulator (M). With a weak frequency modulation can Better determine the direction of polarization. With a strong one Frequency modulation becomes phase modulation Faraday modulation causes.
- phase modulators (M) can be the transfer matrix of the coil of the sensor optical fiber (10) determine.
- a ⁇ / 4 light guide loop (9) e.g. B.
- a ⁇ / 4 delay plate can be used.
- the sensor optical fiber (10) a solid optical sensor could be used.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gyroscopes (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Transform (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
- 1
- Lichtquelle, Laserdiode
- 2
- Zuleitungslichtfaser, HB-Lichtfaser
- 3, 5, 7
- Speißstellen, optische Kopplungsstellen
- 4, 6
- erste und zweite Referenzlichtfasern, HB-Lichtfasern
- 8
- LB-Lichtfaser
- 9
- λ/4-Verzögerungseinrichtung,
λ/4-Lichtfaserschleife - 10
- Sensorlichtfaser, optischer Sensor,
Sensorschleife - 11
- Ausgang von 8
- 12 - 15
- Schwingungsebenen
- l
- Länge von 4 und 6
- M
- Phasenmodulator
Claims (5)
- Faseroptischer Transmissionssensora) mit einer Lichtquelle (1),b) die über eine polarisationserhaltende, stark doppelbrechende ersten Referenzlichtfaser (4) mit einer ersten und dazu orthogonalen zweiten optischen Hauptachse, wobei in der ersten optischen Hauptachse die Ausbreitungsgeschwindigkeit des Lichtes größer ist als in der zweiten optischen Hauptachse, undc) über eine polarisationserhaltende, stark doppelbrechende zweite Referenzlichtfaser (6) mit einer ersten und dazu orthogonalen zweiten optischen Hauptachse, wobei in der ersten optischen Hauptachse die Ausbreitungsgeschwindigkeit des Lichtes größer ist als in der zweiten optischen Hauptachse, sowied) über eine λ/4-Verzögerungseinrichtung (9) mit einem optischen Sensor (10) in optischer Verbindung steht,e) ferner mit mindestens einem Phasenmodulator (M), der mit einer der beiden ersten oder zweiten Referenzlichtfasern (4, 6) in Wirkverbundung steht,f) daß die erste Referenzlichtfaser (4) die gleiche Länge (l) wie die zweite Referenzlichtfaser (6) aufweist undg) mit dieser um 90° gedreht optisch verbunden ist, derart, daß die erste optische Hauptachse der ersten Referenzlichtfaser (4) mit der zweiten optischen Hauptachse der zweiten Referenzlichtfaser (6) verbunden ist und die zweite optische Hauptachse der ersten Referenzlichtfaser (4) mit der ersten optischen Hauptachse der zweiten Referenzlichtfaser (6).
- Faseroptischer Transmissionssensor nach Anspruch 1, dadurch gekennzeichnet, daß die Lichtquelle (1) über eine polarisationserhaltende, stark doppelbrechende Zuleitungslichtfaser (2) mit einer ersten und dazu orthogonalen zweiten optischen Hauptachse, wobei in der ersten optischen Hauptachse die Ausbreitungsgeschwindigkeit des Lichtes größer ist als in der zweiten optischen Hauptachse, mit der ersten Referenzlichtfaser (4) bezüglich deren erster und zweiter optischen Hauptachsen um 45° gedreht optisch verbunden ist, derart, daß die erste und zweite optischen Hauptachsen der ersten Referenzlichtfaser (4) mit den ersten und zweiten optischen Hauptachsen der Zuleitungslichtfaser (2) einen Winkel von 45° bilden.
- Faseroptischer Transmissionssensor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die λ/4-verzögerungseinrichtung (9) eine λ/4-Schleife einer niedrigdoppelbrechenden Lichtfaser (8) ist.
- Faseroptischer Transmissionssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die λ/4-Verzögerungseinrichtung (9) mit der zweiten Referenzlichtfaser (6) optisch gekoppelt ist.
- Faseroptischer Transmissionssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die λ/4-Verzögerungseinrichtung (9) und der optische Sensor (10) aus einer einzigen, niedrigdoppelbrechenden optischen Faser bestehen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4344856 | 1993-12-29 | ||
DE4344856A DE4344856A1 (de) | 1993-12-29 | 1993-12-29 | Faseroptischer Transmissionssensor mit Modulator |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0661524A2 EP0661524A2 (de) | 1995-07-05 |
EP0661524A3 EP0661524A3 (de) | 1996-12-18 |
EP0661524B1 true EP0661524B1 (de) | 1999-02-24 |
Family
ID=6506464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94810697A Expired - Lifetime EP0661524B1 (de) | 1993-12-29 | 1994-12-05 | Faseroptischer Transmissionssensor mit Modulator |
Country Status (7)
Country | Link |
---|---|
US (1) | US5471546A (de) |
EP (1) | EP0661524B1 (de) |
JP (1) | JPH07218272A (de) |
CN (1) | CN1064453C (de) |
DE (2) | DE4344856A1 (de) |
PL (1) | PL175436B1 (de) |
RU (1) | RU94045131A (de) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2744246B1 (fr) * | 1996-01-30 | 1998-03-13 | Alcatel Nv | Modulateur kerr independant de la polarisation, et dispositif de recuperation toute optique d'horloge comprenant un tel modulateur |
DE19605717C1 (de) * | 1996-02-16 | 1997-05-28 | Abb Research Ltd | Faseroptische Meßeinrichtung |
US5850375A (en) * | 1996-07-30 | 1998-12-15 | Seagate Technology, Inc. | System and method using optical fibers in a data storage and retrieval system |
DE59802264D1 (de) * | 1997-09-23 | 2002-01-10 | Trench Switzerland Ag Basel | Kombinierter kleinsignal-strom- und spannungswandler |
JP4082049B2 (ja) * | 2002-03-12 | 2008-04-30 | 富士通株式会社 | 光送信装置 |
US7227925B1 (en) | 2002-10-02 | 2007-06-05 | Varian Medical Systems Technologies, Inc. | Gantry mounted stereoscopic imaging system |
US7945021B2 (en) | 2002-12-18 | 2011-05-17 | Varian Medical Systems, Inc. | Multi-mode cone beam CT radiotherapy simulator and treatment machine with a flat panel imager |
US7412029B2 (en) * | 2003-06-25 | 2008-08-12 | Varian Medical Systems Technologies, Inc. | Treatment planning, simulation, and verification system |
US7640607B2 (en) | 2005-04-29 | 2010-01-05 | Varian Medical Systems, Inc. | Patient support systems |
US7880154B2 (en) | 2005-07-25 | 2011-02-01 | Karl Otto | Methods and apparatus for the planning and delivery of radiation treatments |
CA2531177A1 (en) * | 2005-12-30 | 2007-06-30 | Jesse Zheng | Differential birefringent fiber frequency-modulated continuous-wave sagnac gyroscope |
EP2088925B8 (de) | 2006-11-17 | 2015-06-17 | Varian Medical Systems, Inc. | Dynamisches patientenpositionierungssystem |
USRE46953E1 (en) | 2007-04-20 | 2018-07-17 | University Of Maryland, Baltimore | Single-arc dose painting for precision radiation therapy |
WO2011160235A1 (en) | 2010-06-22 | 2011-12-29 | Karl Otto | System and method for estimating and manipulating estimated radiation dose |
US10806409B2 (en) | 2016-09-23 | 2020-10-20 | Varian Medical Systems International Ag | Medical systems with patient supports |
CN110554229B (zh) * | 2019-07-23 | 2021-10-01 | 北京航天时代光电科技有限公司 | 新型非介入式全光纤互易型电压电场传感器 |
CN113655625B (zh) * | 2021-09-03 | 2023-09-05 | 西华大学 | 一种具有抗大气湍流能力的光束的装置 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4529312A (en) * | 1981-07-29 | 1985-07-16 | The Board Of Trustees Of The Leland Stanford Junior University | Fiber optic rotation sensor utilizing unpolarized light |
US4615582A (en) * | 1981-11-09 | 1986-10-07 | The Board Of Trustees Of The Leland Stanford Junior University | Magneto-optic rotator for providing additive Faraday rotations in a loop of optical fiber |
US4733938A (en) * | 1981-11-09 | 1988-03-29 | The Board Of Trustees Of The Leland Stanford Junior University | Magneto-optic rotator |
JPS5919875A (ja) * | 1982-07-27 | 1984-02-01 | Toshiba Corp | 磁界測定装置 |
US4603296A (en) * | 1984-05-15 | 1986-07-29 | The United States Of America As Represented By The Secretary Of The Navy | Fiber optic DC magnetometer without hysteresis ambiguity |
US4683421A (en) * | 1985-03-29 | 1987-07-28 | Westinghouse Electric Corp. | Drift compensation technique for a magneto-optic current sensor |
DE3606558A1 (de) * | 1986-02-28 | 1987-09-03 | Philips Patentverwaltung | Messanordnung zur ermittlung der laengenabhaengigen daempfung von monomode-lichtwellenleitern nach dem rueckstreuverfahren |
US4997282A (en) * | 1986-09-19 | 1991-03-05 | Litton Systems, Inc. | Dual fiber optic gyroscope |
DE3638345A1 (de) * | 1986-11-10 | 1988-05-19 | Felten & Guilleaume Energie | Einrichtung und verwendung eines lichtwellenleiter-sensors fuer minimale dehnungen |
DE3726411A1 (de) * | 1987-08-07 | 1989-02-16 | Siemens Ag | Faseroptischer magnetfeldsensor |
US4915503A (en) * | 1987-09-01 | 1990-04-10 | Litton Systems, Inc. | Fiber optic gyroscope with improved bias stability and repeatability and method |
DE3923803A1 (de) * | 1989-07-19 | 1991-01-31 | Messwandler Bau Ag | Faseroptische anordnung zum messen der staerke eines elektrischen stromes |
IT1232330B (it) * | 1989-09-12 | 1992-01-28 | Cise Spa | Sensore a fibra ottica polarimetrico |
DE3942819C2 (de) * | 1989-12-23 | 1993-12-02 | Deutsche Aerospace | Faserkreisel mit einer Faserspule |
US5051577A (en) * | 1990-03-20 | 1991-09-24 | Minnesota Mining And Manufacturing Company | Faraday effect current sensor having two polarizing fibers at an acute angle |
JPH05149752A (ja) * | 1991-07-12 | 1993-06-15 | Sumitomo Electric Ind Ltd | 光フアイバジヤイロ |
US5377283A (en) * | 1992-05-29 | 1994-12-27 | Honeywell Inc. | Configuration control of mode coupling errors |
CA2105785A1 (en) * | 1992-09-10 | 1994-03-11 | Akihiro Ooka | Optical fiber type polarizer |
-
1993
- 1993-12-29 DE DE4344856A patent/DE4344856A1/de not_active Withdrawn
-
1994
- 1994-12-05 EP EP94810697A patent/EP0661524B1/de not_active Expired - Lifetime
- 1994-12-05 DE DE59407842T patent/DE59407842D1/de not_active Expired - Fee Related
- 1994-12-13 US US08/354,809 patent/US5471546A/en not_active Expired - Fee Related
- 1994-12-21 PL PL94306449A patent/PL175436B1/pl unknown
- 1994-12-26 RU RU94045131/25A patent/RU94045131A/ru unknown
- 1994-12-27 JP JP6325734A patent/JPH07218272A/ja active Pending
- 1994-12-29 CN CN94120030A patent/CN1064453C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE4344856A1 (de) | 1995-07-06 |
PL306449A1 (en) | 1995-07-10 |
CN1118073A (zh) | 1996-03-06 |
JPH07218272A (ja) | 1995-08-18 |
US5471546A (en) | 1995-11-28 |
RU94045131A (ru) | 1996-10-20 |
PL175436B1 (pl) | 1998-12-31 |
CN1064453C (zh) | 2001-04-11 |
EP0661524A2 (de) | 1995-07-05 |
DE59407842D1 (de) | 1999-04-01 |
EP0661524A3 (de) | 1996-12-18 |
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